<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <!-- 引入animate.css 的 cdn -->
  <link href="https://cdn.bootcdn.net/ajax/libs/animate.css/4.1.1/animate.min.css" rel="stylesheet">
  <style>
    .div1 {
      width: 100px;
      height: 100px;
      background-color: red;
    }
  </style>
</head>

<body>
  <div class="div1 animate__animated animate__rotateOutDownLeft"></div>
</body>

</html>